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Texas Instruments SN74ABT245BDW
- Part No.:
- SN74ABT245BDW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT245BDW.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,176
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Product details
Overview
SN74ABT245BDW from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in 5-V TTL systems. It features high-drive capability (−32 mA IOH, 64 mA IOL), hot-insertion support via Ioff and power-up 3-state, and operates across −40°C to 85°C. Used in industrial backplane interfaces, memory expansion modules, and legacy system bus bridging.
For engineers reviewing the SN74ABT245BDW datasheet, SN74ABT245BDW pinout, SN74ABT245BDW application, or SN74ABT245BDW equivalent, key selection criteria include its SOIC-20 package thermal resistance (58°C/W), guaranteed 3.2 ns max tPHL at 5 V, ±100 µA Ioff at VCC = 0 V, and compatibility with 5-V TTL logic families in mixed-voltage board designs.
Technical Context
This device implements dual-directional 8-bit data flow controlled by DIR (direction) and OE (output enable) inputs, enabling either A→B or B→A transmission while isolating buses when OE is high. Its output structure supports true 3-state operation during power-up/down sequences without external pull-ups.
The SN74ABT245BDW uses ABT-series bipolar transistor technology to achieve low ground bounce (<1 V VOLP), latch-up immunity (>500 mA per JESD 17), and ESD robustness (2000-V HBM, 200-V MM). All inputs tolerate 0–5.5 V, and outputs are specified for VO up to 5.5 V in high-impedance or powered-off states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation across standard 5-V supply tolerances in industrial environments. |
| IOH / IOL | −32 mA / 64 mA - drives heavy capacitive loads (e.g., long PCB traces or multiple TTL inputs) without signal degradation. |
| tPHL / tPLH | 1 ns min / 3.9 ns max - enables reliable 100+ MHz bus switching in synchronous control applications. |
| Ioff | ±100 µA at VCC = 0 V - prevents damaging backflow current during hot-swap or partial-power-down scenarios. |
| VOL / VOH | 0.55 V max at IOL = 64 mA / 2.0 V min at IOH = −32 mA - meets TTL input thresholds under full load conditions. |
| θJA | 58°C/W (SOIC-DW) - defines thermal derating limits for continuous operation at ambient temperatures up to 85°C. |
| ESD Rating | 2000-V HBM, 200-V MM - exceeds JEDEC JESD22-A114/A115 requirements for board-level handling robustness. |
Pinout & Package
SN74ABT245BDW is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body size, 1.75 mm max height, with 0.65 mm lead pitch and gull-wing leads. RoHS-compliant NiPdAu lead finish, MSL Level-1, 260°C peak reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs/Outputs | Port A bidirectional data lines; driven by internal transistors when enabled and DIR set appropriately. |
| 9 | GND | Power ground reference for all internal circuitry and output drivers. |
| 10, 11, 12, 13, 14, 15, 16, 17 | B1–B8 Inputs/Outputs | Port B bidirectional data lines; electrically isolated from A port when OE is high. |
| 18 | VCC | 5-V supply input; powers all logic and output stages; bypass capacitor required near pin. |
| 19 | DIR | Direction control: low = B→A, high = A→B; TTL-compatible threshold (VIL ≤ 0.8 V, VIH ≥ 2 V). |
| 20 | OE | Output enable: low = active, high = 3-state isolation; includes power-up 3-state circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Hot-insertion support | Ioff and power-up 3-state prevent current backflow and bus contention during live board insertion. |
| High-drive outputs | −32 mA sink / 64 mA source capability maintains signal integrity driving 10+ TTL loads or 50 pF trace capacitance. |
| Low ground bounce | <1 V VOLP at VCC = 5 V, TA = 25°C - reduces noise coupling into adjacent analog or clock circuits. |
| Latch-up immunity | Exceeds 500 mA per JEDEC JESD17 - ensures survivability under transient overcurrent events. |
| Wide input voltage range | VI = 0 to 5.5 V on all pins - allows interfacing with mixed-supply systems without level shifters. |
Applications
| Industrial Backplane Interface | Legacy Memory Expansion Module |
|---|---|
|
Use Scenario: Isolating CPU address/data bus from peripheral card slots in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional bus buffer enabling hot-swappable I/O cards while maintaining signal integrity across 15 cm backplane traces. Use Value: 64 mA IOL drives 50 pF + 100 Ω characteristic impedance traces; 3.9 ns max tPHL supports 100 MHz burst transfers. |
Use Scenario: Extending 8-bit data path between microcontroller and parallel SRAM/Flash in retro-computing hardware. IC Role / Device Role / Timing Role: Direction-controlled transceiver synchronizing read/write cycles between processor and memory banks. Use Value: VOH ≥ 2.0 V at −32 mA ensures TTL-compatible read strobes; Ioff < ±100 µA prevents memory corruption during reset. |
| Automated Test Equipment (ATE) Fixture | Programmable Logic Interposer |
|
Use Scenario: Signal conditioning and isolation between FPGA-based pattern generator and DUT socket in boundary-scan test systems. IC Role / Device Role / Timing Role: 3-state-enabled bus switch routing stimulus signals while preventing backdrive during DUT power cycling. Use Value: Power-up 3-state eliminates need for external pull-up resistors on OE; 2000-V HBM withstands repeated probe contact. |
Use Scenario: Level-shifting and bus arbitration between CPLD configuration logic and external I²C/SPI peripherals. IC Role / Device Role / Timing Role: Bidirectional interface managing shared control lines between multiple programmable devices. Use Value: DIR-controlled direction eliminates separate control logic; 58°C/W θJA allows operation in sealed test enclosures at 70°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245A | 3.3-V only operation (1.65–3.6 V), lower drive (−24/24 mA), CMOS process. | Not suitable for 5-V TTL systems; requires level translation if interfacing with legacy 5-V peripherals. | Select when migrating to 3.3-V domains with lower power budgets and no 5-V compatibility requirement. |
| SN74ABT244BDW | Octal buffer (unidirectional), same ABT family, identical SOIC-20 package and pinout except DIR removed. | Cannot perform bidirectional A↔B data transfer; used where direction is fixed or externally controlled. | Choose when system architecture uses dedicated upstream/downstream paths instead of shared bidirectional bus. |
Compared with SN74LVC245A and SN74ABT244BDW, the SN74ABT245BDW uniquely delivers 5-V TTL compatibility, bidirectional control via DIR, and hot-swap readiness-making it irreplaceable in legacy industrial backplanes requiring robust 5-V signal integrity and live insertion.
Availability
SN74ABT245BDW is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy memory expansion modules, automated test equipment fixtures, and programmable logic interposers requiring stable component supply across extended product lifecycles.
Supply support for SN74ABT245BDW includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of experience in industrial-grade interface ICs.
The ABT logic family-including SN74ABT245BDW-is engineered for high-noise industrial environments, delivering robust 5-V TTL performance, hot-swap resilience, and compatibility with legacy bus architectures.
FAQ
What is the maximum operating temperature range for the SN74ABT245BDW?
The SN74ABT245BDW is rated for operation from −40°C to +85°C ambient temperature. This industrial-grade range ensures reliability in factory automation, motor control, and outdoor instrumentation applications where thermal extremes are common. The SOIC-DW package's 58°C/W thermal resistance supports continuous operation within this envelope when proper PCB copper area and airflow are maintained.
Does the SN74ABT245BDW support hot insertion, and how is it implemented?
Yes, the SN74ABT245BDW supports hot insertion via two integrated features: Ioff circuitry disables outputs when VCC = 0 V (limiting backflow current to ±100 µA), and power-up 3-state holds outputs high-impedance during power ramp-up. These functions eliminate bus contention and prevent damage when inserting or removing boards while system power remains active-critical for modular PLC and ATE systems.
What are the absolute maximum ratings for VCC and input voltage on the SN74ABT245BDW?
The SN74ABT245BDW has an absolute maximum VCC rating of −0.5 V to +7 V and input voltage (VI) rating of −0.5 V to +7 V on all pins. However, recommended operation is limited to VCC = 4.5–5.5 V and VI = 0–VCC. Exceeding these ranges-even briefly-risks permanent damage, especially beyond the 5.5-V upper limit for sustained 5-V TTL system use.
How does the DIR pin control data flow direction in the SN74ABT245BDW?
The DIR pin determines data direction: when DIR = low, data flows from B bus to A bus; when DIR = high, data flows from A bus to B bus. This TTL-compatible control (VIH ≥ 2 V, VIL ≤ 0.8 V) enables simple microcontroller GPIO or FPGA pin assignment. Direction changes occur synchronously with OE activation-no setup/hold timing constraints apply between DIR and data transitions.
Can the SN74ABT245BDW be used in mixed-voltage systems with 3.3-V logic?
The SN74ABT245BDW is not recommended for direct connection to 3.3-V logic without level translation. Its inputs accept 0–5.5 V, but outputs swing rail-to-rail (0 V to VCC ≈ 5 V), exceeding 3.3-V I/O tolerances. For mixed-voltage designs, use discrete resistive dividers on outputs or pair with a dedicated level shifter like TXS0108E-never rely on internal clamping or undefined behavior outside its 4.5–5.5 V VCC specification.
SN74ABT245BDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ABT245BDW FAQ
1.How can I place an order for SN74ABT245BDW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT245BDW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74ABT245BDW reliable?
The price and inventory of SN74ABT245BDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT245BDW is usually 5 days.
3.What payment methods are accepted for SN74ABT245BDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT245BDW transactions.
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4.How is shipping managed for SN74ABT245BDW?
SN74ABT245BDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT245BDW order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN74ABT245BDW?
For technical support, including SN74ABT245BDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT245BDW requirements.
6.How does Aetrix verify that SN74ABT245BDW is sourced from the original manufacturer or authorized distributors?
All SN74ABT245BDW products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74ABT245BDW meets industry standards.
7.What is the process for return or replacement of SN74ABT245BDW?
All SN74ABT245BDW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT245BDW, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN74ABT245BDW part is unused and in its original packaging.
Return procedure for SN74ABT245BDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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